Additional Duties
It was a signalman's duty to check each train that passed his signal box, looking for the red tail lamp exhibited on the trailing vehicle, the sighting of which confirmed that the train was still complete, and thus the section was clear.
Each train movement was logged, by hand, in a Train Register Book, and it was normal practice to provide a special desk to support this sizeable book. As well as train movements, every communication between signalmen and adjacent signal boxes via bell codes (when accepting trains or dealing with a token) was logged.
Technological advances including mechanical fixed signals in the 1840s, the electric telegraph and block working in the 1850s, and proper mechanical interlocking from 1856, allowed safer, more expeditious train working, and more complicated track layouts to be controlled single-handedly. The advent of such technological advances gradually led to the provision of an enclosed workspace known as a signal box, signal cabin or interlocking tower.
Read more about this topic: Signalman (rail)
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